Abstract: A wireless tattoo device is disclosed. The device includes an electronics housing, a control panel, a power source, and a motor assembly driven by the power source. A motor housing is attached to the electronics housing, and the motor housing defines a passage dimensioned to receive a portion of the motor assembly. A grip defines an opening dimensioned to receive an end of the motor housing. The motor housing is configured to receive a needle cartridge. The motor housing and the grip are rotatable relative to each other such that a depth of the needle cartridge relative to the grip varies based on a relative rotation position between the motor housing and the grip.

Abstract: A cardinality estimation method and an apparatus are provided. The method includes: selecting a target model type from a plurality of model types based on a target distribution feature and mapping relationship information, where the mapping relationship information includes a mapping relationship between the plurality of model types and a predicted distribution feature, and the target distribution feature is extracted from sample data collected based on an analysis instruction; and obtaining, based on the target model type, a target model corresponding to the target model type, where the target model is used to perform cardinality estimation on a query instruction of a database.

Abstract: The present invention discloses a unit commitment method considering security region of wind turbine generators with frequency response control, and the main steps are: 1) determining security region of wind turbine generators when provides frequency response; 2) based on the security region of the wind turbine generators when provides frequency response, establishing a unit commitment model considering security region of wind turbine generators; and 3) calculating the unit commitment model considering the security region of the wind turbine generators by using mixed-integer linear programming method, and obtaining the operation result of the unit commitment considering the security region of the wind turbine generators with frequency response control. The present invention can be widely used in the setting of frequency response parameters of wind turbine generators dispatched in the prior art and the start-stop and output plans of synchronous generator.

Abstract: The present invention discloses a unit commitment method considering security region of wind turbine generators with frequency response control, and the main steps are: 1) determining security region of wind turbine generators when provides frequency response; 2) based on the security region of the wind turbine generators when provides frequency response, establishing a unit commitment model considering security region of wind turbine generators; and 3) calculating the unit commitment model considering the security region of the wind turbine generators by using mixed-integer linear programming method, and obtaining the operation result of the unit commitment considering the security region of the wind turbine generators with frequency response control. The present invention can be widely used in the setting of frequency response parameters of wind turbine generators dispatched in the prior art and the start-stop and output plans of synchronous generator.

Abstract: A wireless tattoo device is disclosed. The device includes an electronics housing, a control panel, a power source, and a motor assembly driven by the power source. A motor housing is attached to the electronics housing, and the motor housing defines a passage dimensioned to receive a portion of the motor assembly. A grip defines an opening dimensioned to receive an end of the motor housing. The motor housing is configured to receive a needle cartridge. The motor housing and the grip are rotatable relative to each other such that a depth of the needle cartridge relative to the grip varies based on a relative rotation position between the motor housing and the grip.

Abstract: A data storage method applying to the phase change memory and a phase change memory are provided. After obtaining to-be-stored data, the phase change memory generates an erase pulse signal and a write pulse signal according to the to-be-stored data. The to-be-stored data is multi-bit data. The write pulse signal is a signal including at least two consecutive pulses with a same amplitude. The amplitude of the at least two consecutive pulses is a value determined according to the to-be-stored data. Then, the phase change memory applies the erase pulse signal to a storage unit of the phase change memory to allow the storage unit to switch to a crystalline state. Further, the write pulse signal is applied to the storage unit to allow the storage unit to switch to an amorphous state corresponding to a first resistance value, where the amorphous state represents the to-be-stored data.

Abstract: A data storage method applying to the phase change memory and a phase change memory are provided. After obtaining to-be-stored data, the phase change memory generates an erase pulse signal and a write pulse signal according to the to-be-stored data. The to-be-stored data is multi-bit data. The write pulse signal is a signal including at least two consecutive pulses with a same amplitude. The amplitude of the at least two consecutive pulses is a value determined according to the to-be-stored data. Then, the phase change memory applies the erase pulse signal to a storage unit of the phase change memory to allow the storage unit to switch to a crystalline state. Further, the write pulse signal is applied to the storage unit to allow the storage unit to switch to an amorphous state corresponding to a first resistance value, where the amorphous state represents the to-be-stored data.

Abstract: A magnetic storage track and a magnetic memory are provided. The magnetic storage track includes multiple stacked storage track units. A transition layer is disposed between two neighboring storage track units. The transition layer is constituted by a semiconductor material deposited on an insulating material, and includes a gating circuit and a read/write apparatus. Because the magnetic storage track includes multiple stacked storage track units, a track length of the magnetic storage track is constituted by track lengths of the multiple storage track units. Therefore, when a storage capability of the magnetic storage track needs to be improved, the track length of the magnetic storage track may be increased by adding the storage track unit.

Abstract: A latch and a D flip-flop, where the latch includes a switch, a resistive random-access memory, a bleeder circuit, and a voltage converter. The voltage converter is configured to output an output signal of the latch according to an input signal of the latch when the switch is in an on state, where the output signal remains consistent with the input signal. When the switch changes from the on state to an off state, the resistive random-access memory is configured to work together with the bleeder circuit to enable an output signal of the latch when the switch is in the off state to remain consistent with an output signal of the latch when the switch is in the on state, thereby implementing a nonvolatile latching function. A circuit structure of the latch is simple and integrity of an existing logic circuit can be improved.